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Active low-pass digital filter realized by using digital processing unit

A technology of digital filter and digital processor, applied in the direction of digital technology network, impedance network, electrical components, etc., can solve problems such as unsatisfactory effect and word length restriction

Inactive Publication Date: 2011-06-15
GUANGDONG YADA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides an active low-pass digital filter implemented by a digital processor to solve the technical problem that the high-order low-pass filter in the prior art is restricted by the operation speed and the word length of the DSP, and the effect is not ideal

Method used

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  • Active low-pass digital filter realized by using digital processing unit
  • Active low-pass digital filter realized by using digital processing unit
  • Active low-pass digital filter realized by using digital processing unit

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] figure 1 It is the circuit schematic diagram of the filter to be realized in the present invention. The active filter requires that the DC part of the harmonic detection filter is the passband (the ideal gain is 1), and the cutoff band is at 200Hz and above. The cutoff frequency must be less than 200Hz, and the order selection is mainly determined by the passband and stopband. Determined by corner frequency, passband and stopband ripple coefficients. Odd-order Chebyshev (chebyshev) type I low-pass filter has no attenuation at DC, and there is no requirement for the passband index. The stopband requires attenuation to -20dB at 200Hz, so several orders are acceptable. The higher the order, the shorter the transition band. Steep, the lower pass bandwidth of the same stop band index can improve the response speed, so the higher ...

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Abstract

The invention relates to low-pass digital filters, and in particular relates to an active low-pass digital filter realized by using a digital processing unit. The digital processing unit adopts a 16-bit word length; a filter is an odd-order Chebyshev filter; and the order of the filter is 1 or 3. By selecting a filter with a proper order, the active low-pass digital filter can be preferably applied to the existing digital processing units at the same time of meeting requirements of stop bands.

Description

technical field [0001] The invention relates to a low-pass digital filter, in particular to an active low-pass digital filter realized by a digital processor. Background technique [0002] The detection of harmonic current by active filter basically adopts the method of instantaneous reactive power theory plus digital filter function. The harmonic detection effect has a lot to do with the design of the digital low-pass filter. Since it is generally required that the DC part of the digital filter is a passband (the ideal gain is 1), and 200Hz and above is a cutoff band, and the selection of the order is mainly determined by the corner frequency of the passband and the stopband, and the ripple coefficient of the passband and the stopband decided. The cut-off frequency must be less than 200Hz. The odd-order Chebyshev (chebyshev) type I low-pass filter has no attenuation at the DC, and there is no requirement for the passband index. The stopband requires attenuation to -20dB a...

Claims

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Application Information

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IPC IPC(8): H03H17/02
Inventor 汤晓宇张静邓大智
Owner GUANGDONG YADA ELECTRONICS
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